Debian requires everything that we distribute to be Free. See Social
Contract Clause One:[1]

1. Debian will remain 100% free
We provide the guidelines that we use to determine if a work is
"free" in the document entitled "The Debian Free Software
Guidelines". We promise that the Debian system and all its
components will be free according to these guidelines. We will
support people who create or use both free and non-free works on
Debian. We will never make the system require the use of a
non-free component.
Old version said:
"We promise to keep the Debian GNU/Linux Distribution entirely free
software. As there are many definitions of free software, we include
the guidelines we use to determine if software is "free" below."
It was logical: Debian valued the freedom of a software on the basis
of a free software definition.
Now, Debian values the freedom of a song with a free software definition.
It's unlogical and juridically absurd (because "The Debian Free
Software Guidelines" speaks only about software).
Max